MINI GUI绘图

/* 
** $Id: painter.c,v 1.6 2004/09/29 05:35:24 suowei Exp $
**
** Listing 15.1
**
** painter.c: Sample program for MiniGUI Programming Guide
**      Painting by using mouse.
**
** Copyright (C) 2004 Feynman Software.
**
** License: GPL
*/

#include <minigui/common.h>
#include <minigui/minigui.h>
#include <minigui/gdi.h>
#include <minigui/window.h>
#include <minigui/control.h>


static int PainterWinProc(HWND hWnd, int message, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    static BOOL bdraw = FALSE;
    static int pre_x, pre_y;

    switch (message) {
    case MSG_LBUTTONDOWN:
        SetCapture(hWnd);
        bdraw = TRUE;
        pre_x = LOWORD (lParam);
        pre_y = HIWORD (lParam);
        break;

    case MSG_MOUSEMOVE:
    {
        int x = LOWORD (lParam);
        int y = HIWORD (lParam);

        if (bdraw) {
            ScreenToClient(hWnd, &x, &y);
            hdc = GetClientDC(hWnd);
            SetPenColor(hdc, PIXEL_red);
            MoveTo(hdc, pre_x, pre_y);
            LineTo(hdc, x, y);
            ReleaseDC(hdc);
            pre_x = x;
            pre_y = y;
        }
        break;
    }

    case MSG_LBUTTONUP:
    {
        int x = LOWORD (lParam);
        int y = HIWORD (lParam);

        if (bdraw) {
            ScreenToClient(hWnd, &x, &y);
            hdc = GetClientDC(hWnd);
            SetPixel (hdc, x, y, PIXEL_red);
            ReleaseDC(hdc);
            bdraw = FALSE;
            ReleaseCapture();
        }
        break;
    }

    case MSG_RBUTTONDOWN:
        InvalidateRect(hWnd, NULL, TRUE);
        break;

    case MSG_CLOSE:
        DestroyAllControls (hWnd);
        DestroyMainWindow (hWnd);
        PostQuitMessage (hWnd);
        return 0;
    }

    return DefaultMainWinProc (hWnd, message, wParam, lParam);
}

int MiniGUIMain (int args, const char* arg[])
{
    MSG Msg;
    HWND hMainWnd;
    MAINWINCREATE CreateInfo;

#ifdef _LITE_VERSION
    SetDesktopRect(0, 0, 1024, 768);
#endif
    
    CreateInfo.dwStyle = WS_VISIBLE | WS_BORDER | WS_CAPTION;
    CreateInfo.dwExStyle = WS_EX_NONE;
    CreateInfo.spCaption = "Painter";
    CreateInfo.hMenu = 0;
    CreateInfo.hCursor = GetSystemCursor(0);
    CreateInfo.hIcon = 0;
    CreateInfo.MainWindowProc = PainterWinProc;
    CreateInfo.lx = 0;
    CreateInfo.ty = 0;
    CreateInfo.rx = 240;
    CreateInfo.by = 320;
    CreateInfo.iBkColor = COLOR_lightwhite;
    CreateInfo.dwAddData = 0;
    CreateInfo.hHosting = HWND_DESKTOP;
    
    hMainWnd = CreateMainWindow (&CreateInfo);
    
    if (hMainWnd == HWND_INVALID)
        return -1;

    ShowWindow(hMainWnd, SW_SHOWNORMAL);

    while (GetMessage(&Msg, hMainWnd)) {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }

    MainWindowThreadCleanup (hMainWnd);

    return 0;
}

#ifndef _LITE_VERSION
#include <minigui/dti.c>
#endif